Showing papers in "International Journal of Heat and Mass Transfer in 1975"

TL;DR: In this paper, a simple expression for the space-mean Nu (or Sh ) for all Ra and Pr (or Sc) in terms of the model of Churchill and Usagi was developed.

TL;DR: In this article, a simple empirical expression for the mean value of Nu over the cylinder for all Ra and all Pr is developed in terms of the model of Churchill and Usagi.

TL;DR: In this paper, a short retrospective review of the works mainly performed by Soviet authors in the field of mathematical description of heat and mass transfer phenomena in capillary-porous bodies is presented.

TL;DR: In this paper, a numerical study of the effects of transients and variable properties on single droplet evaporation into an infinite stagnant gas is presented, and it is found that initial size Ro is eliminated from the problem on scaling time with respect to R20 and that the evaporative process becomes quasi-steady with ( R R 0 ) 2 = ( R∗ 0 R 0 ), 2 − βt R 2 0, as suggested by experiment.

TL;DR: In this article, more than thirty ways of predicting the relationship between turbulent transfers of momentum and a passive contaminant such as heat or dissolved matter are examined, divided into seven classes, on the basis of method of derivation or field of application.

TL;DR: In this paper, the Sieder-Tate equation for liquids and the two equations of Petukhov for gases and liquids are combined to calculate heat transfer coefficients to variable property liquid metals.

TL;DR: In this paper, values of local flow properties, obtained by solving appropriate conservation equations in finite-difference form and with boundary conditions corresponding to four furnace arrangements, are presented and compared with measurements.

TL;DR: In this article, a least squares-matching technique is presented to analyze fully developed laminar fluid flow and heat transfer in ducts of arbitrary cross-section, where forced convection heat transfer is considered under constant axial heat-transfer rate with arbitrary peripheral thermal boundary conditions.

TL;DR: In this paper, the authors reported new experimental measurements on the natural convective heat transport through a horizontal layer of air, covering the Rayleigh number range from subcritical to 4 × 106.

TL;DR: In this paper, the effect of free-stream turbulence on heat transfer from heated cylinders placed normal to an air stream was investigated and a correlation equation was presented that enables the stagnation point heat transfer as a function of turbulence intensity to be determined.

TL;DR: In this article, the authors measured the effect of inclination and aspect ratio on the rate of heat transfer in a laminar natural convection in silicone oil and air in a long rectangular channel.

TL;DR: In this article, a buoyancy-driven convection in a differentially heated vertical porous layer is studied theoretically by the method developed by Gill, where the model is of finite extent, and the temperature difference between the vertical walls is assumed to be large.

TL;DR: In this article, the authors used Pohlhausen's equation to determine the initial thickness of the evaporating microlayer of a hemispherical vapour bubble on a superheated horizontal wall.

TL;DR: In this paper, the parameters which control the momentum and heat transfer performance of a rough surface in a uniform channel flow are presented in a novel way, and a new efficiency parameter is denned for optimising this performance.

TL;DR: In this paper, the authors measured the transfer coefficients resulting from the impingement of a slot jet on a plane surface using naphthalene sublimation technique and found that the surface distributions of the transfer coefficient were bell-shaped, with the largest value at the stagnation point.

TL;DR: In this paper, the total and local heat transfer from a smooth circular cylinder to the cross flow of air has been measured over the Reynolds number range 3 × 104 and 3 × 3, respectively.

TL;DR: The convective heat transfer resulting from a granular flow over a heated surface is investigated in this paper, where the specific type of flow considered is that in which adjacent material particles are in physical contact.

TL;DR: In this paper, the Isotherm migration method is extended to two dimensions and a convenient finite-difference method of solution is described for a variety of initial and boundary conditions.

TL;DR: In this article, the growth rate of vapour bubbles has been investigated experimentally up to departure in water boiling at pressures varying from 26·7 to 2·0 kPa (the corresponding Jakob number increasing from 108 to 2689).

TL;DR: In this article, heat transfer from a horizontal fine cylinder by pure forced convection at small Reynolds numbers or by pure free convection in small Grashof numbers is analyzed without restriction on Prandtl number by the method of joining the circumferential average temperature in the concentric layer around the cylinder governed mainly by conduction to that in the wake or plume governed mainly with convection.

TL;DR: In this article, a theoretical Nusselt type analysis is proposed for the condensate film taking into account the drag effects of contra-flowing vapour, and a performance prediction relates rates of heat transfer, rotational speeds, temperature differences across Condensate films, fluid properties and heat pipe geometry.

TL;DR: In this paper, the authors derived explicit matrix formulae for the calculation of total exchange areas in the context of Hottel's zone method and obtained working relations for the case of a uniform grey absorbing-emitting/isotropically-scattering medium confined in a Lambert enclosure.

TL;DR: In this paper, the authors measured local impingement cooling effectiveness and heat-transfer coefficients over the interaction area of an air jet impinging on a wall and subjected to a cross flow of air.

TL;DR: In this article, the authors present a technique for the analysis of unsteady, two-dimensional diffusive heat-or mass-transfer problems characterized by moving irregular boundaries, including an immobilization transformation and a numerical scheme.

TL;DR: In this article, a correlation to determine the initial point of net vapor generation for water and Refrigerant-22 is given, and a scaling law to predict this point for other liquids than those mentioned above has also been established.

TL;DR: In this paper, exact solutions for temperature and moisture distribution as well as the position of the moving evaporation front in a porous half-space were obtained for two mathematical models, corresponding to the drying of the moist body in the period of decreasing rate and the intensive drying in the presence of molar transfer in the region of eva-oration.

TL;DR: In this article, the maximum evaporation time and Leidenfrost point for discrete drops of water deposited on smooth surfaces of stainless steel, brass and Monel, at pressures ranging to 75 lb/in2 are obtained and compared.

TL;DR: In this paper, the systeme des equations des couches limites dynamiques and thermiques dans le cas d'un ecoulement incompressible a repartition de vitesse initiales lineaire and a faibles gradients de proprietes physiques variables was discussed.

TL;DR: In this paper, the authors present angegebenen rund 50 Formfaktoren Grundlage einer Vielzahl von geometrischen Anordnungen, denen skalare potentialfelder zugrundeliegen.